An Introduction to Software Radio
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1 An Introduction to Software Radio (and a bit about GNU Radio & the USRP) Eric Blossom eb@comsec.com comsec.com/wiki USENIX / Boston / June 3, 2006
2 What's Software Radio? It's a technique for building wireless communication systems. Get the software as close to the antenna as you can. No modulation specific h/w Software defines the signals transmitted, sample by sample. Software demodulates/decodes the samples received.
3 S/W Radio Block Diagram
4 Pros... Extreme flexibility On the fly reconfiguration Can do multiple (different) things simultaneously Much quicker development cycle In-field upgrades are possible No soldering irons required... It's a simple matter of programming!
5 Cons... Relatively high power consumption relative to fixed function ASICs. Higher cost if flexibility not important High symbol rate systems require FPGA or ASIC to support data rates A/D performance is limiting factor
6 Why now? Low cost of compute cycles & memory General Purpose Processor (GPP) Digital Signal Processor (DSP) Field Programmable Gate Array (FPGA) A/D's and D/A's are now good enough
7 Where is it used today? Military Research: Academic & Industry Cellular basestations SIGINT
8 Expected uses Public Safety interoperability Handsets (enabled by new DSPs) New personal communicators New kinds of networks
9 Wireless networking Life beyond WLAN and broadcast Software radio provides flexibility All parts of the stack are hackable Take advantage of multicast nature of the medium Lots of research opportunities
10 Still need some h/w Getting from RF to samples Getting from samples to RF
11 RF / IF / samples Usually two steps: RF to IF (downconversion) Sample at IF Either direct conversion or superheterodyne Can sample at baseband or passband Nyquist: need > 2 * bandwidth of interest
12 A/D performance Sample rate khz to GHz Resolution 8 to 24 bits Spurious free dynamic range (SFDR) maxes out at about 110 db SFDR
13 Analog vs Digital Processing Analog: Tremendous dynamic range Non-ideal behavior Variation from part to part Variation over temp & time Digital: Perfectly reproducible behavior Complex operations are easy
14 Cognitive Radio S/W Radio + AI Observe the environment (RF, regulatory...) Evolve operating configuration E.g., frequency, modulation, channel coding... Optimize what?
15 S/W Radio Tools & Frameworks C / C++ MATLAB / SIMULINK Software Communications Architecture (SCA) Used in Joint Tactical Radio System (JTRS) CORBA is the answer, what was the question? GNU Radio (Python and C++)
16 Regulatory issues FCC: politicians, lawyers, economists, engineers s/w radio is an enabling technology Helps with spectrum scarcity How to control / regulate? Some argue justification for FCC is gone What is interference? Property vs Commons What if each cow brought its own grass?
17 And on to GNU Radio...
18 What's GNU Radio? Free software toolkit for: Building and deploying software radios Learning about DSP and communication systems Creating new kinds of radios, modulations, protocols, development environments... Licensed under GPL A community effort
19 GNU Radio Architecture / Impl Data flow abstraction Signal processing blocks and connections between them Event based overlay Message Queues and Messages Hybrid C++ / Python system Typically run on general purpose processor Hello World example
20 Hello World #!/usr/bin/env python from gnuradio import gr from gnuradio import audio class my_graph(gr.flow_graph): def init (self): gr.flow_graph. init (self) sample_rate = ampl = 0.1 src0 = gr.sig_source_f(sample_rate, gr.gr_sin_wave, 350, ampl) src1 = gr.sig_source_f(sample_rate, gr.gr_sin_wave, 440, ampl) dst = audio.sink(sample_rate) self.connect(src0, (dst, 0)) self.connect(src1, (dst, 1)) if name == ' main ': try: my_graph().run() except KeyboardInterrupt: pass
21 Signal Processing Blocks Input streams and output streams I/O signature Type of each stream is specified Blocks specifies constraints on # of streams Relative i/o rates Fixed 1:1, Fixed interp 1:N, Fixed decim N:1 Variable
22 Who's using GNU Radio? Academic researchers Industry / DARPA researchers Various government research groups Hackers Hams Radio Astronomers Scanning Probe Microscopists
23 Applications Transceivers Research in wireless networking Ad-hoc networks MIMO STAP / Adaptive beam forming Cognitive Radio Passive Radar (PCL) Geolocation SIGINT Conventional Amateur stuff Radio Astronomy
24 Cognitive Radio Many efforts using GNU Radio DARPA ACERT (BBN) Virginia Tech CMU Rutgers WINLAB Often in combination with Click Modular Router
25 Waveforms Now: AM, FM, SSB ATSC VSB-8 FSK, GMSK, PSK Coming: OFDM Fast Freq Hopper Direct Sequence
26 Coming attractions...
27 Message Blocks More natural support for packetized data Leverage existing code base Abstractions: Blocks / Messages / Protocol classes / Ports Connections between end points Data + metadata (packet annotation) Support for precise timing Hierarchical composition Nest classic GNU Radio within m-block
28 Message Blocks (2)
29 Passive Radar (PCL) Use existing transmitters (e.g., TV, Radio) Very high dynamic range front end 2 x 2 phased array TDOA, doppler, angle of arrival ESPRIT output: position, velocity, object class Superresolution techniques
30 Existence proof!
31 Why? The USRP
32 Sound Cards, etc Relatively low sampling rate 48 khz or 96 khz, 16 or 24 bits Good for audio input and output Can be used with narrow and low IF Examples Narrow band HF (SDR 1000) Digital Radio Mundial
33 Wide Band I/O PCI A/D and D/A Cards Good Bus Bandwidth Expensive to Very Expensive ($1k - $10k) Still need RF Front End
34 VXI / cpci /... Card cages full of cards RF Front Ends Digital Receiver / Transmitter Typically A/D, D/A + FPGA or ASIC FPGA / DSP / GPP High speed interconnect Lots of choices Typically very expensive.
35 USRP 80% solution at 10% of the cost Low cost Small / portable Design is completely open Multiple coherent channels
36 USRP
37 USRP Block Diagram
38 Available RF Daughterboards 400 MHz 500 MHz transceiver 800 MHz 1 GHz transceiver GHz transceiver 50 MHz 800 MHz receive only 800 MHz 2.4 GHz receive only Basic Tx and Rx (baseband i/o)
39 emulab.net University of Utah networking testbed Expect 20 nodes around campus by end of year. Uses USRP hardware with: 2.4 GHz transceivers (?) 400 MHz 500 MHz transceivers (?) 50 MHz 800 MHz receive only
40 Resources GNU Radio: discuss-gnuradio mailing list USRP:
41 Questions?
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